[1D01-07] Surface Science / Structure (SS3)

4:15 PM - 4:30 PM JST(7:15 AM - 7:30 AM UTC)

[1D07] STM measurement of Perfluorodecanethiol

*Marika Murakami¹, Hiroshi Ohoyama¹, Takuya Matsumoto², Tomoki Misaka¹ (1. Graduate School of Science, Osaka University (Japan), 2. Research Center for Neuromorphic AI Hardware, Kyushu Institute of Technology (Japan))

Triboelectric charging is a well-known electrostatic phenomenon; however, its microscopic mechanism remains unresolved. Our group previously observed nanoscale triboelectric charging on a self-assembled monolayer (SAM) of 1H,1H,2H,2H-perfluorodecanethiol (F-DT) using an AM-FM AFM. Although spike-like signals were detected, their temporal fluctuations could not be explained from the AFM topography. In this study, scanning tunneling microscopy (STM) was employed to investigate the nanoscale local structure of the F-DT/Au(111) surface. STM observations revealed pit structures with a depth of approximately 2 Å, consistent with reported vacancy islands, as well as bright spots with heights ranging from approximately 1 to 3 Å. The broader height distribution of the bright spots indicates local structural inhomogeneity on the SAM surface. The characteristic size of these structures is comparable to the AFM tip–sample contact area, suggesting that local surface structures undetectable by AFM may contribute to the temporal fluctuations in triboelectric spike generation.

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